import { _decorator, Component } from 'cc';
import { UICloseReason } from './UILayer';
import { AppKernel } from '../../app/AppKernel';
import type { UIViewID } from '../../define/UIDefine';

const { ccclass } = _decorator;

@ccclass('UIView')
export class UIView<TParams = unknown> extends Component {
  /** UIManager 用它识别并接管场景中预放置的 UIView。 */
  readonly viewId: UIViewID | null = null;

  public getViewID(): UIViewID {
    if (!this.viewId) {
      return (this?.node?.name || "") as UIViewID;
    }
    return this.viewId;
  }

  /**
   * 在界面创建完成后、显示前执行；首次打开与缓存界面再次打开时，
   * this 都是同一个实际的 UIView 实例。
   */
  async internalOpenBefore(params: TParams): Promise<boolean> {
    return (await this.onBeforeOpen(params)) !== false;
  }

  internalCreate() {
    this.onCreate();
  }

  async internalOpen(params: TParams): Promise<void> {
    this.node.setSiblingIndex(this.node.parent.children.length);
    await this.onOpen(params);
  }

  async internalBeforeClose(reason: UICloseReason): Promise<boolean> {
    return this.onBeforeClose(reason);
  }

  async internalClose(reason: UICloseReason): Promise<void> {
    await this.onClose(reason);
  }

  internalDispose(): void {
    this.onDispose();
  }

  protected onDestroy(): void {
    AppKernel.events.offTarget(this);
  }

  protected async closeSelf() {
    await AppKernel.ui.close(this.getViewID());
  }

  protected onBeforeOpen(_params: TParams): boolean | void | Promise<boolean | void> { return true; }
  protected onCreate(): void | Promise<void> { }
  protected onOpen(_params: TParams): void | Promise<void> { }
  protected onFocus(): void { }
  protected onBlur(): void { }
  protected onBeforeClose(_reason: UICloseReason): boolean | Promise<boolean> { return true; }
  protected onClose(_reason: UICloseReason): void | Promise<void> { }
  protected onDispose(): void { }
}